GLHeightFieldPlugIn.m
/* |
File: GLHeightFieldPlugIn.m |
Abstract: GLHeightFieldPlugin class. |
Version: 1.0 |
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple |
Inc. ("Apple") in consideration of your agreement to the following |
terms, and your use, installation, modification or redistribution of |
this Apple software constitutes acceptance of these terms. If you do |
not agree with these terms, please do not use, install, modify or |
redistribute this Apple software. |
In consideration of your agreement to abide by the following terms, and |
subject to these terms, Apple grants you a personal, non-exclusive |
license, under Apple's copyrights in this original Apple software (the |
"Apple Software"), to use, reproduce, modify and redistribute the Apple |
Software, with or without modifications, in source and/or binary forms; |
provided that if you redistribute the Apple Software in its entirety and |
without modifications, you must retain this notice and the following |
text and disclaimers in all such redistributions of the Apple Software. |
Neither the name, trademarks, service marks or logos of Apple Inc. may |
be used to endorse or promote products derived from the Apple Software |
without specific prior written permission from Apple. Except as |
expressly stated in this notice, no other rights or licenses, express or |
implied, are granted by Apple herein, including but not limited to any |
patent rights that may be infringed by your derivative works or by other |
works in which the Apple Software may be incorporated. |
The Apple Software is provided by Apple on an "AS IS" basis. APPLE |
MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION |
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS |
FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND |
OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS. |
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL |
OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, |
MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED |
AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE), |
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE |
POSSIBILITY OF SUCH DAMAGE. |
Copyright (C) 2009 Apple Inc. All Rights Reserved. |
*/ |
/* It's highly recommended to use CGL macros instead of changing the current context for plug-ins that perform OpenGL rendering */ |
#import <OpenGL/CGLMacro.h> |
#import "GLHeightFieldPlugIn.h" |
#define kQCPlugIn_Name @"OpenGL Height Field" |
#define kQCPlugIn_Description @"Renders a 3D height field from an image." |
#define kSize 128 |
@implementation GLHeightFieldPlugIn |
/* We need to declare the input / output properties as dynamic as Quartz Composer will handle their implementation */ |
@dynamic inputImage, inputColor, inputWireFrame; |
+ (NSDictionary*) attributes |
{ |
/* Return the attributes of this plug-in */ |
return [NSDictionary dictionaryWithObjectsAndKeys:kQCPlugIn_Name, QCPlugInAttributeNameKey, kQCPlugIn_Description, QCPlugInAttributeDescriptionKey, nil]; |
} |
+ (NSDictionary*) attributesForPropertyPortWithKey:(NSString*)key |
{ |
/* Return the attributes for the plug-in property ports */ |
if([key isEqualToString:@"inputImage"]) |
return [NSDictionary dictionaryWithObject:@"Image" forKey:QCPortAttributeNameKey]; |
if([key isEqualToString:@"inputColor"]) |
return [NSDictionary dictionaryWithObject:@"Color" forKey:QCPortAttributeNameKey]; |
if([key isEqualToString:@"inputWireFrame"]) |
return [NSDictionary dictionaryWithObject:@"Wireframe Mode" forKey:QCPortAttributeNameKey]; |
return nil; |
} |
+ (QCPlugInExecutionMode) executionMode |
{ |
/* This plug-in is a consumer (it renders graphics using OpenGL) */ |
return kQCPlugInExecutionModeConsumer; |
} |
+ (QCPlugInTimeMode) timeMode |
{ |
/* This plug-in does not depend on the time (time parameter is completely ignored in the -execute:atTime:withArguments: method) */ |
return kQCPlugInTimeModeNone; |
} |
@end |
@implementation GLHeightFieldPlugIn (Execution) |
- (BOOL) startExecution:(id<QCPlugInContext>)context |
{ |
CGLContextObj cgl_ctx = [context CGLContextObj]; |
int i = 0, |
x, |
y; |
GLenum error; |
if(cgl_ctx == NULL) |
return NO; |
/* Create VBO */ |
glGenBuffers(1, &_vertexBuffer); |
glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer); |
glBufferData(GL_ARRAY_BUFFER, kSize * kSize * 4 * sizeof(GLfloat), NULL, GL_DYNAMIC_COPY); |
glBindBuffer(GL_ARRAY_BUFFER, 0); |
/* Create FBO render buffer */ |
glGenRenderbuffersEXT(1, &_renderBuffer); |
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, _renderBuffer); |
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGBA_FLOAT32_APPLE, kSize, kSize); |
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0); |
/* Create FBO */ |
glGenFramebuffersEXT(1, &_frameBuffer); |
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _frameBuffer); |
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_RENDERBUFFER_EXT, _renderBuffer); |
error = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT); |
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); |
if(error != GL_FRAMEBUFFER_COMPLETE_EXT) { |
glDeleteFramebuffersEXT(1, &_frameBuffer); |
glDeleteTextures(1, &_renderBuffer); |
return NO; |
} |
/* Check for OpenGL errors */ |
if(error = glGetError()) { |
[context logMessage:@"OpenGL error %04X", error]; |
glDeleteFramebuffersEXT(1, &_frameBuffer); |
glDeleteTextures(1, &_renderBuffer); |
return NO; |
} |
/* Allocate indices array for VBO */ |
_indices = malloc((kSize-1) * (kSize-1) * 6 * sizeof(GLuint)); |
if(_indices == NULL) { |
glDeleteFramebuffersEXT(1, &_frameBuffer); |
glDeleteTextures(1, &_renderBuffer); |
return NO; |
} |
for(y = 0; y < kSize - 1; y++) { |
for(x = 0; x < kSize - 1; x++) { |
_indices[i + 0] = x + y * kSize; |
_indices[i + 1] = x + y * kSize + kSize; |
_indices[i + 2] = x + y * kSize + 1; |
_indices[i + 3] = x + y * kSize + 1; |
_indices[i + 4] = x + y * kSize + kSize; |
_indices[i + 5] = x + y * kSize + kSize + 1; |
i += 6; |
} |
} |
return YES; |
} |
- (BOOL) execute:(id<QCPlugInContext>)context atTime:(NSTimeInterval)time withArguments:(NSDictionary*)arguments |
{ |
CGLContextObj cgl_ctx = [context CGLContextObj]; |
id<QCPlugInInputImageSource> image = self.inputImage; |
GLenum error; |
GLint viewport[4]; |
GLint saveMode, |
saveName, |
saveModes[2]; |
GLboolean saveEnabled; |
const CGFloat* colorComponents; |
if(cgl_ctx == NULL) |
return NO; |
/* Bind the FBO as the rendering destination */ |
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, _frameBuffer); |
glGetIntegerv(GL_VIEWPORT, viewport); |
glViewport(0, 0, kSize, kSize); |
glGetIntegerv(GL_MATRIX_MODE, &saveMode); |
glMatrixMode(GL_PROJECTION); |
glPushMatrix(); |
glLoadIdentity(); |
glOrtho(0, kSize, 0, kSize, -1, 1); |
glMatrixMode(GL_MODELVIEW); |
glPushMatrix(); |
glLoadIdentity(); |
/* Draw the texture in its native colorspace */ |
if(image && [image lockTextureRepresentationWithColorSpace:[image imageColorSpace] forBounds:[image imageBounds]]) { |
[image bindTextureRepresentationToCGLContext:cgl_ctx textureUnit:GL_TEXTURE0 normalizeCoordinates:YES]; |
glColor4f(1.0, 1.0, 1.0, 1.0); |
glBegin(GL_QUADS); |
glTexCoord2f(1.0,1.0); |
glVertex3f(kSize, kSize, 0); |
glTexCoord2f(0.0, 1.0); |
glVertex3f(0, kSize, 0); |
glTexCoord2f(0.0, 0.0); |
glVertex3f(0, 0, 0); |
glTexCoord2f(1.0, 0.0); |
glVertex3f(kSize, 0, 0); |
glEnd(); |
[image unbindTextureRepresentationFromCGLContext:cgl_ctx textureUnit:GL_TEXTURE0]; |
[image unlockTextureRepresentation]; |
} |
else { |
glClearColor(0.0, 0.0, 0.0, 0.0); |
glClear(GL_COLOR_BUFFER_BIT); |
} |
/* Copy the rendered pixels into the VBO */ |
glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, _vertexBuffer); |
glReadPixels(0, 0, kSize, kSize, GL_RGBA, GL_FLOAT, NULL); |
glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, 0); |
/* Unbind the FBO and restore previous rendering destination */ |
glMatrixMode(GL_MODELVIEW); |
glPopMatrix(); |
glMatrixMode(GL_PROJECTION); |
glPopMatrix(); |
glMatrixMode(saveMode); |
glViewport(viewport[0], viewport[1], viewport[2], viewport[3]); |
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); |
/* Setup OpenGL state */ |
glMatrixMode(GL_MODELVIEW); |
glPushMatrix(); |
glTranslatef(-0.5, -0.5, -0.5); |
saveEnabled = glIsEnabled(GL_DEPTH_TEST); |
if(!saveEnabled) |
glEnable(GL_DEPTH_TEST); |
if(self.inputWireFrame) { |
glGetIntegerv(GL_POLYGON_MODE, saveModes); |
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); |
} |
colorComponents = CGColorGetComponents(self.inputColor); |
glColor4f(colorComponents[0], colorComponents[1], colorComponents[2], colorComponents[3]); |
/* Draw the VBO */ |
glEnableClientState(GL_VERTEX_ARRAY); |
glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer); |
glVertexPointer(4, GL_FLOAT, 0, NULL); |
glDrawElements(GL_TRIANGLES, (kSize - 1) * (kSize - 1) * 6, GL_UNSIGNED_INT, _indices); |
glBindBuffer(GL_ARRAY_BUFFER, 0); |
glDisableClientState(GL_VERTEX_ARRAY); |
/* Restore OpenGL state */ |
if(!saveEnabled) |
glDisable(GL_DEPTH_TEST); |
if(self.inputWireFrame) { |
glPolygonMode(GL_FRONT, saveModes[0]); |
glPolygonMode(GL_BACK, saveModes[0]); |
} |
glPopMatrix(); |
/* Check for OpenGL errors */ |
if(error = glGetError()) |
[context logMessage:@"OpenGL error %04X", error]; |
return (error ? NO : YES); |
} |
- (void) stopExecution:(id<QCPlugInContext>)context |
{ |
CGLContextObj cgl_ctx = [context CGLContextObj]; |
if(cgl_ctx == NULL) |
return; |
/* Destroy OpenGL resources */ |
glDeleteFramebuffersEXT(1, &_frameBuffer); |
glDeleteRenderbuffersEXT(1, &_renderBuffer); |
glDeleteBuffers(1, &_vertexBuffer); |
/* Destroy index buffer */ |
free(_indices); |
} |
@end |
Copyright © 2009 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2009-10-27